.cabecera{
				background-color: #333;
				padding: 2em;
				text-align: center;
				margin-bottom: 1em;
				color: whitesmoke;
}

.form_add tr td {
				padding: 1em;
				
}
.form_add tr td input {
				width: 20em;
}
.form_add tr td textarea {
				width: 40em;
				height: 10em;
}